Well my opinion is that if you are using your own style, not trying to force yourself into one, then your style is HOW you express your creativity. For instance if you use vivid colors and long strokes with paintings and you enjoy that then thats your style so it will make your creativity come out in full bloom. However forcing yourself to different styles is the exact opposite. (Thats my take on it anyways, I am not really into art so dont put a lot behind it)